UKV - Airflow damper

Airflow management damper for rectangular ducts

Rectangular VAV and CAV with factory-set airflow range limits option (min./max. airflow rates). Used for different airflow and duct pressure control applications. Pressure-independent operation. Available in various rectangular modular sizes.

Design airflow range limits shall be calibrated at the factory. Controller settings shall be adjustable on site with a PC or a handheld tool. The airflow controller shall have control signal input 0...10 VDC or 2 ...10 VDC and output 0...10 VDC or 2...10VDC for airflow feedback. Supply power shall be 24 VAC.

The Halton UKV is a variable air volume control damper for ventilation systems. The damper can function electrically, with maximum and minimum set values for volume flow rate, factory preset. The damper can also be used as constant air volume control damper. The damper maintains an airflow rate in a duct branch in accordance with the set value independent of duct upstream pressure variation. The set value can be achieved by room temperature controller with output (0...10VDC or 2...10VDC) which will reset the airflow rate for the required value.

Variation of upstream pressure will affect the measurement system; it will notice a difference between the set point and measured value. Volume controller will send a signal to the actuator to recover the set value.

The dampers can be connected to a building management system, whereupon they can be remotely controlled. In such a case, the volume flow rates in different spaces of the building can also be monitored.

The Halton UKV meets the requirements of EN 1751 tightness class 1

Models E6 and E7 operates as fast running actuators and do not include airflow controller. Use the Halton Laboset for airflow control.

Controllers EM, EK, EC, EE and ED include a dynamic differential pressure sensor with a low bypass airflow rate through the sensor element. Therefore, these controllers are not to be used in highly contaminated environments. The pressure sensor of the EG unit is based on a membrane with no flow through the sensor element. Controllers EC and EE include Belimo's MP-bus connection.

The adjustable airflow control range is presented in the table below. For airflow controllers EM, EK, EC, EE and EG, the highest available minimum airflow rate equals the specified maximum airflow rate. Minimum and maximum airflow rates are calculated as percentage of damper's nominal airflow.

For the ED controller, the highest minimum airflow rate is 80% of the specified maximum airflow rate. Maximum airflow is calculated as percentage of nominal airflow and minimum airflow as percentage of maximum airflow.

Safety distances

The airflow control damper is installed taking into account the required safety distances. Install the unit into ductwork in such a way that the air flow direction through the unit is as indicated with the arrow in the unit casing.

For the pressure control damper the minimum safety distance for the static measurement tab after the control damper is 5 x D. Please refer to job drawings.

Wiring

The wiring shall be carried out in accordance with local regulations and by professional technicians.

For the power supply of all control options, a safety-isolating transformer shall be used.

The actual airflow rate can also be determined from the pictures below.

The actual airflow rate can be calculated as a function of differential pressure at the measurement probe and the measurement probe k factor. The proper k factor can be found in an attachment for the product.

The Halton UKV airflow controller is equipped with a pressure sensor, and there is a very low airflow through the differential pressure sensor of the controller. Therefore, a manual differential measurement manometer can be connected in parallel to the airflow controller (for example with tube T-branches) and both measurements can operate in parallel with continuous control.

If Halton UKV is ordered without factory pre-set minimum and maximum flow values (FS=NA), minimum flow value will be set to 0 and maximum flow value is equal to nominal flow value.

Duct pressure control

The actual measured airflow rate can be defined by the controller feedback signal and airflow controller nominal airflow.

Design airflow range limits shall be calibrated at the factory. Controller settings shall be adjustable on site with a PC or a handheld tool. The airflow controller shall have control signal input 0...10 VDC or 2 ...10 VDC and output 0...10 VDC or 2...10VDC for airflow feedback. Supply power shall be 24 VAC.

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